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Filter Total Items: 3377

Water dispersal of vegetative bulbils of the invasive exotic Dioscorea oppositifolia L. in southern Illinois

Riparian corridors promote dispersal of several species of exotic invasives worldwide. Dispersal plays a role in the colonization of exotic invasive species into new areas and this study was conducted to determine if the invasiveness of Dioscorea oppositifolia L. (Chinese yam) is facilitated by secondary dispersal of vegetative diaspores (bulbils) by water. Since seed production of this plant has
Authors
J.R. Thomas, D.J. Gibson, B.A. Middleton

Population manipulations

Abstract not supplied at this time
Authors
C. K. Dodd

Amphibian Research and Monitoring Initiative (ARMI): A successful start to a national program in the United States

Most research to assess amphibian declines has focused on local-scale projects on one or a few species. The Amphibian Research and Monitoring Initiative (ARMI) is a national program in the United States mandated by congressional directive and implemented by the U.S. Department of the Interior (specifically the U.S. Geological Survey, USGS). Program goals are to monitor changes in populations of am
Authors
Gary M. Fellers, Erin Muths, C. Kenneth Dodd, D. Earl Green, William A. Battaglin, P. Stephen Corn, M. J. Adams, Alisa L. Gallant, Robert N. Fisher, Cecil R. Schwalbe, Larissa L. Bailey, Walter J. Sadinski, Robin E. Jung, Susan C. Walls

Improving removal-based estimates of abundance by sampling a population of spatially distinct subpopulations

 A statistical modeling framework is described for estimating the abundances of spatially distinct subpopulations of animals surveyed using removal sampling. To illustrate this framework, hierarchical models are developed using the Poisson and negative-binomial distributions to model variation in abundance among subpopulations and using the beta distribution to model variation in capture probabili
Authors
R.M. Dorazio, H.L. Jelks, F. Jordan

Critical literature review of the evidence for unpalatability of amphibian eggs and larvae

We examined 142 papers, which contained 603 separate predator-prey trials, to investigate whether unpalatability is an important defense against predation for amphibian eggs and larvae. Although unpalatability is often cited as an antipredator defense, it was rarely demonstrated that 89% of the trials that we reviewed found prey to be palatable. The most extensively studied taxa, the genera Bufo a
Authors
Margaret S. Gunzburger, Joseph Travis

Dilemma of the common species: Florida Box Turtles

Abstract not supplied at this time
Authors
C. K. Dodd

Southern marl prairies conceptual ecological model

About 190,000 ha of higher-elevation marl prairies flank either side of Shark River Slough in the southern Everglades. Water levels typically drop below the ground surface each year in this landscape. Consequently, peat soil accretion is inhibited, and substrates consist either of calcitic marl produced by algal periphyton mats or exposed limestone bedrock. The southern marl prairies support compl
Authors
S.M. Davis, W.F. Loftus, E.E. Gaiser, A.E. Huffman

Attempted predation at a pileated woodpecker nest by a gray ratsnake

Abstract not supplied at this time
Authors
L.I. Casey, J.E. Earl, S. A. Johnson

Morphometry, gross morphology and available histopathology in North Atlantic right whale (Eubalaena glacialis) mortalities (1970 to 2002)

Fifty-four right whale mortalities have been reported from between Florida, USA and the Canadian Maritimes from 1970 to 2002. Thirty of those animals were examined: 18 adults and juveniles, and 12 calves. Morphometric data are presented such that prediction of body weight is possible if the age, or one or more measurements are known. Calves grew approximately linearly in their first year. Total le
Authors
M.J. Moore, A.R. Knowlton, S.D. Kraus, W.A. McLellan, R. K. Bonde